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Hot dry rock (<i>HDR</i>) power stations have the potential to serve as an energy storage system for large-scale photovoltaic (<i>PV</i>) plants. For flexible operation, thermal storage (<i>TS</i>) power stations are required to coordinate with <i>HDR</i> power stations. In this study, a hybrid power system is constructed by combining the <i>HDR</i>, <i>TS</i>, and <i>PV</i> plants. Game theory is then introduced into the optimal dispatch of the hybrid power system. Considering <i>HDR</i>, <i>TS</i>, and <i>PV</i> as players, non-cooperative and cooperative game dispatching models are established and verified by a case in the Gonghe basin of Qinghai. Finally, the stability of the coalitions and the rationality of allocation of the hybrid power system is verified, and the sensitivity of critical parameters is analyzed. The results demonstrate that the overall payoff of the hybrid power system is increased by 10.15%. The payoff of the <i>HDR</i> power station is increased by 16.5%. The <i>TS</i> power station has obtained 50% of the total extra profits. The <i>PV</i> plant reduces the impact on the grid to obtain the priority of grid connection. Based on these results, a theoretical basis can be provided for developing generation systems based on the <i>HDR</i> resources in the Gonghe Basin.